How many significant figures are there in 0.00723 m?
6
5
4
3
2
Express 0.00723 m in scientific notation.
723 x 10-5 m
72.3 x 10-4 m
7.23 x 10-3 m
7.23 x 103 m
723 x 105 m
After doing a calculation the display shows the number 3760.289 on the calculator. If the answer is supposed to have three significant figures, the correct way to display the answer would be:
376
3760.
3.76 x 103
3.76 x 102
376 x 101
Using the rules for significant figures, calculate the following: (8.790 - 13)/3.90
-1.03
-1
-1.08
-1.1
--1.079
One meter contains how many micrometers?
1 x 106
1 x 10-6
1 x 103
1 x 109
1 x 10-9
The melting point of the element palladium (atomic #46) is 1552°C. What is the melting point of palladium on the Fahrenheit scale?
(TF = TC x (9°F/5°C) + 32°F)
524576°F
1825°F
3000°F
2825.6°F
2826°F
If the melting point of palladium is 1552°C, in what physical state does palladium exist at 2000°C?
solid
liquid
gas
a mixture of solid and liquid
not enough information to answer the question
Which of the following is an example of a pure substance?
pure water
granite
air
gun powder
none of these
All measurements in science involve a degree of:
precision
accuracy
uncertainty
disorder
conversion
A solid sample of a metal is submerged in a large graduated cylinder. The water level in the graduate was 55.25 mL and the final level was 61.00 mL. If the mass of the object was determined to be 23.795 g, what is the density of the metal?
4.138 g/mL
4.13 g/cm3
4.14 g/cm3
4.1 g/cm3
4 g/mL
Convert 0.0023 mm to meters.
2.3 m
2.3 x 103 m
2.3 x 106 m
0.000023 m
2.3 x 10-6 m
Benzene is a nonpolar molecule, liquid at room temperature, with a density of 0.8787 g/cm3. When mixed with water, benzene will:
blend with the water until the mixture appears homogeneous.
float on top of the water
sink to the bottom
solidify
vaporize
You measure the mass of one object on a scale on which the "slider" has marks for each consecutive gram. You measure the mass of a second object on a digital scale the displays mass in grams to three decimal places. When you add the masses of the two objects, to what decimal place can you record your final answer?
0.01 g
0.1 g
1 g
10 g
none of these
The difference in mass between a high school boy's discus and a high school girl's discus is 0.616 kilograms. Convert this difference to lbs.
(1 kilogram = 2.205 lb)
1.36 lb
1.358 lb
0.279 lb
0.2794 lb
1.4 lb
Which of the following equalities is incorrect?
1.35 micrometers = 1.35 x 103 millimeters
0.079 mL = 0.079 cm3
7.43 x 10-2 nanoliters = 7.43 x 10-8 milliliters
3.5 kilograms = 3.5 x 106 milligrams
1.89 x 104 deciliters = 1.89 x 103 liters
You are given five pieces of pure aluminum, all of different sizes. You measure both the mass and volume of each piece, and plot mass vs. volume on a graph. Assuming your results are accurate, the plot on your graph is:
parabolic
hyperbolic
a single point
a straight line
circular
The density of mercury is 13.5939 g/cm3. Calculate the mass in kilograms of a drum full of mercury with the following dimensions: height = 1.100 meters, diameter = 0.492 meters. Assume pi has a value of 3.14.
2.84 x 106 kg
2.09 x 102 kg
2.84 x 103 kg
2.84 kg
2.84 x 10-3
Substances with constant composition that cannot be broken down into simpler substances by chemical processes are:
elements
compounds
mixtures
solutions
salts
Which of the following is not a fundamental SI unit?
gram
candela
mole
Kelvin
meter
The freezing of water is:
a chemical change because it involves a change in energy
a physical change because there is no color change
a chemical change because ice is less dense than liquid water
a physical change because both ice and liquid water consist solely of H2O
a chemical change because it does not take place spontaneously